Nut lock



April zo, 1926.

R. ,R. CHILDS Filed NOV.. l2 1925 Patented Apr. 20, 19264.

UNiTEDisTATEs PATENT OFFICE..

ROBERT R. CHILDS, 0F ROANOKE, l VIRGINIA, .ASSIGNORl 0F PART INTERESTS TO W. I-I. WOOD, OF SALEM, VIRGINIA; J. L. EARLY, 0F SALTVILLE, VIRGINIA; BEN C.

MooMAw, or noANoKn, viRGiNIA; J.

T. LAYMAN, 0F AMSTERDAM, VIRGINIA;

W. H. MOOMAW, OF ROANOKE, VIRGINIA; AND I'VIERMAN TAKOBSSOLL TAVKOMA PARK, MARYLAND.

Application filed November To all wiz-0m. t may 00a-cern:

Be it known that I, ROBERT R. CHILDS, a citizen of the United States, residing at Roanoke, in the county of Roanoke and State of Virginia, have invented certain new and useful Improvements in Nut Locks, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in nut locks and it is an object of the invention to provide a device of this kind wherein the bolt is provided with meanshcoacting with .the nut to hold the same against retrograde rotation and particuarly upon v'lbration of the work to which the bolt is applied. n

Another object of the invention is to provide a device of this kind which is particularly adapted for use in connection with motors and movable structures, such as aero p-lanes and the like.

The invent-ion consists in the details of construction andV in the combination and arrangement of the several parts of my improved iiut lock whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed tov describe the same with reference to the accompanying drawing, wherein z- Figure l is a view partly in elevation and partly in section of a nut lock constructed in accordance with an embodiment of my invention;

Figure 2 is a view in top planof the structure as illustrated in Figure l; Y

Figure 3 is a fragmentary view in perspective of the outer or free end portion of the bolt; v

Figure 4 is a view in perspective 0f the locking member unapplied.

As disclosed in the accompanying drawing, B denotes a bolt of a conventional type upon the outer or free end portion of which is adapted to be threaded the usual nut N. The outervor free Vend portion of the bolt i NUT LOCK.

12, 1925. Serial No. 68,625.

B .is recessed, as at l, with the inner end or base 2 of said recess having its inner straight edge substantially radial to the bolt B proper while the side wall 3 is disposed toward the free endof the bolt B on a slight incline and inwardly of the base 2.

The locking member LA constitutes a block which substantially fills the cut out portion 1 except that the inner facethereof has its major portion disposed, as at 4, on a slight inward incline, said portion 4 extending inwardly of the member L beyond the center of such face. This inclined portion 4 provides a space 5 when the member L is in app-lied position so that uponvibration of the work with which the bolt B is engaged, the member L will have a tendency to rock resulting in increased frictional contact with the bore of the nut N and thus holding the same against retrograde movement. The remaining portion o-f the inner face of the member L is disposed on an incline similar'to the inclinedwall 3 of the bolt B and adapted to have close contact therewith at all points whereby effective means are provided for assuring the member L being maintained in applied position and particularly when the nut N is operatively engaged with the bolt.

l/Vhen the nut N has a tendency'to unscrew the locking member or block L will rock sideways and the threaded engagement between the nut N and the member or block L is such, as the nut N moves outwardly of the bolt B, to causel the member or block L to move outwardly and such outward movement of the member or block L due to the coacting inclined faces 3 and 4 will result in the member or block L moving outwardly in a radial direction and having effective wedging action on the nut N.

From the foregoing description it is thought to be obvious that a nut lock constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason I do not wish to be understood as limiting' myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed.

I claim A nut lock comprising a bolt having a portion of its threaded free end cut away to form a longitudinal recess with a flat surface slightly inclined in longitudinal direction, the recess being deeper at the bottom than at the top; a block inserted in the recess, substantially filling the same, the inner face of the block having its major portion inclined for close contact with the inclined surface of the recess of the bolt, the remaining portion of said inner face of the block being beveled, and a nut having threaded engagement with the bolt and the applied block, unscrewing rotation of thefnut rocking the block in a direction transversely of the bolt and moving the block outwardly of the inclined surface of the recess of the bolt, said outward movement of the block causing the block to be moved substantially radial of the bolt into wedging action upon the nut.

In testimony whereof I hereunto affix my signature.

ROBERT R. CHILDS. 

